Exterior control of the power valve of a carburetor



Jan. 31, 1967 B. WALKER 3,301,540

EXTERIOR CONTROL OF THE POWER VALVE OF A CARBURETOR Filed Sept. 28, 1965 United States Patent 3,301,540 EXTERIOR CONTROL OF THE POWER VALVE OF A CARBURETOR Brooks Walker, 1280 Columbus Aye., San Francisco, Calif. 94133 Filed Sept. 28, 1965, Ser. No. 502,800 4 Claims. (Cl. 261-69) This application is a continuation-in-part of my prior filed application Serial No. 184,018, filed April 2, 1962, now abandoned.

This invention relates to an exterior control of the power valve of a carburetor.

In accordance with the prior art the carburetor had to be partially dismantled to alter or disengage the power valve in the carburetor. This led to a great deal of timeconsuming and difiicult work.

In accordance with this invention the problems of the prior art are overcome by providing an exterior adjustment of a vacuum (suction from engine manifold) operated power valve as well as a manual control from the drivers compartment to render said power valve operative or inoperative as well as adjusting the flow of fuel through the power valve.

Other features will be more particularly pointed out in the accompanying specification and claims.

I have illustrated my invention by way of example in the accompanying drawings, in which:

FIG. 1 is a side elevation of a carburetor partly cut away showing one form of the invention;

FIG. 2 is a side elevation of a portion of a carburetor showing another form of the invention; and

FIG. 3 is a reduced scale side elevation of a vehicle partly cut away showing the installation of this invention.

In all figures like numerals refer to corresponding parts.

In FIG. 1 I have shown a carburetor having a float bowl 10a forming a chamber 11 for the fuel and float 4. A fuel feed line 6 feeds fuel under pressure to the float bowl in the usual manner. The carburetor has the usual throttle shaft 8 and throttle control arm 9 and may have a fast idle when choked and accelerator pump connections (not shown) if desired; however, this invention is concerned mainly with exterior adjustments and remote controls for the power valve.

A float bowl cover 12 is secured to the bowl body 10a by screws 13. Idle adjustment screws 7 control the idle fuel in the usual manner. A power valve 17 is held in its closed position as shown in FIG. 1 with the shoulder thereof on the upper face of the flange 17b of valve 17 seating on the inside face of fitting 15. Orifice 15a is partially closed by taper end 17a of power valve stem 17c so that the farther taper stem 17a is forced down by vacuum controlled stem 26 and end 26a the more fuel will pass orifice 15a and the smaller diameter of the upper portion of taper stem 17a.

Ordinarily a vacuum piston which may have a seal 25a is connected by passages 22 and 21 to a passage leading below the butterfly on throttle shaft 8 as generally described in Glens Auto Repair Manual, copyright 1962, published by Chilton 00., Library of Congress Card 627749, pages 232-236. The conventional construction does not involve a tapered end 17a on power valve stem.

Since the piston 25 and associated rod 26 are normally held up by the suction (over 10" Hg) which overcomes the force of spring 27, the spring 18 seats the flange 17b on its seat to shut off the power valve 17. When the vacuum drops below a predetermined value (about 10" Hg), spring 27 forces piston 25 and rod 26 and end 26a down and, in the prior art, would fully open normally straight valve 17a so fuel could flow past orifice 15a through holes 15c to passages 19 and 19a to the main jets to enrich them over the flow from the manual main jets 14, generally de- Patented Jan. 31, 1967 scribed in said Glens Auto Repair Manual (1962 edition).

In my construction, rod 30 includes an end portion or abutment 30a positioned between the lowermost coil of the spring 27 and the end 26a of the rod 26, the end p0r tion 30a permanently engaging the lowermost coil of the spring 27 and moving said lowermost coil upwardly along the rod 26 when the rod 30 is moved upwardly. The end portion 30a includes a looped portion which surrounds the rod 26 and is slidably engaged therewith.

Rod 30 extends through cover 12 with upper end 30b thereof pivotally secured to arm 35. Arm 35 is pivoted to cover 12 by pin 36 and carries adjustment screw 37 and lock nut 38.

Adjustment of the screw member 37 limits the movement of the arm 35, thereby limiting the movement of the rod 30. This limitation on the movement of rod 30 limits the biasing action and downward travel limit of the spring 27 and thereby the position of piston 25.

The power valve 17 includes a biasing spring 18 which normally biases the valve 17 tothe off or closed position. The valve 17 also includes a tapered power valve stem 17a whereby the position of the stem 17a in the opening 15a of the fitting 15 will control the amount of fuel passing through said opening.

The piston 25 is normal-1y under an upward force sufficient to overcome the downward force of the spring 27 on the rod 26 and rod end 26a. When the vacuum decreases, the piston 25 moves downwardly due to the inability thereof to overcome the downward force produced by spring 27 until the upward and downward forces balance.

By adjusting screw 37 the maximum downward movement of spring 27 and therefore piston 25 and rod 26 is controlled to control the maximum downward movement of the valve stem 17a caused thereby. In this manner the extent of opening of tapered valve stem 17a is controlled from outside the carburetor and an exterior adjustment of the power valve is provided. Such adjustment can also control the amount of opening of shoulder 71b from the seat inside fitting 15 as an exterior fine or micro adjustment of flow of fuel past the power valve assembly.

In the event an adjustment from the inside of the car to which the carburetor is attached is necessary such as eliminating the power valve for restricted driving in a city and then being able to cut it in for passing on a mountain grade where there is room to pass, I have provided in FIG. 2 a control knob 45 accessible from the drivers compartment back of the instrument panel 50. Knob 45 is secured to Bowden wire 42 in flexible conduit 43 and provides a remote operation of lever 40 by connection to end 40b of lever 40. Flexible conduit 43 is secured to the instrument panel by nut 44 and by a support 46 at or near the carburetor. Lever 40 is pivoted to the carburetor float bowl cover 12 by pin 41. The lower end of lever 40 carries cam 40a which rides against adjustment screw 37 to control rod 30 and the amount of opening or inoperativeness of power valve stem 17a and associated parts can be controlled from the vicinity of the instrument panel.

I have illustrated my invention in these various forms; however, many other variations may be possible within the scope of this invention.

To those skilled in the art to which this invention relates many changes in construction and widely differing embodiments and applications of the invention will suggest themselves without departing from the spirit and scope of the invention The disclosures and description herein are purely illustrative and are not intended to be in any sense limiting.

I claim:

1. A carburetor comprising a float bowl, a throttle valve, an induction passage for air and fuel, a main fuel passage for conducting fuel from said bowl to Said induction passage, an auxiliary fuel passage for conducting fuel from said bowl into said main passage, a valve in said bowl for controlling the flow of fuel through said auxiliary passage, and means for regulating the position of said valve, said regulating :means comprising means biasing the valve to closed position, means acting against the said biasing means for biasing the valve to a maximum open position, and vacuum responsive means for adjusting the bias of said second mentioned biasing means Whereby to adjust the opening of the valve in proportion to the degree of vacuum; said valve comprising an orifice, a tapered pin, and means mounting said pin for reciprocating movement in the orifice; said second mentioned biasing means comprising a contact for abutting engagement with said tapered pin and a spring for urging said contact toward said abutting engagement, and means for selectively adjusting said maximum open position, said adjusting means comprising an abutment in engagement with the spring of said second mentioned biasing mean and means on the bowl for adjusting the position of the abutment relative to the closed position independently of the contact.

2. A device as defined in claim 1 wherein the adjusting means for the abutment comprises a lever pivotally attached to the float bowl at one end thereof, an adjustable abutment screw mounted in the other end of the 'lever for adjustable contact with the bowl, and a rod pivotally mounted on the lever between the ends thereof and carrying said abutment.

3. A device as defined in claim 1 wherein the adjusting means for the abutment comprises a first lever pivotally attached to the float bowl at one end thereof and an adjustable abutment screw mounted in the other end, a second lever pivotally mounted on the float bowl, a cam carried by said second lever in engagement with said screw, and means for pivoting said second lever and therewith the cam for adjusting the position of the abutment relative to the valve.

4. A device as defined in claim 3 further including means for pivoting the lever from a position remote from the carburetor.

References Cited by the Examiner UNITED STATES PATENTS 2,204,527 6/1940 Boyce 26169 2,320,012 5/1943 Riall 261-69 X 2,321,211 6/1943 Johnson 26l69 2,653,804 9/1943 Cedarholm 26169 X 2,757,913 9/1953 Sutton et al. 26169 X 2,922,629 11/1960 Germano et al. 261-69 X HARRY B. THORNTON, Primary Examiner RONALD R. WEAVER, Examiner. 

1. A CARBURETOR COMPRISING A FLOAT BOWL, A THROTTLE VALVE, AN INDUCTION PASSAGE FOR AIR AND FUEL, A MAIN FUEL PASSAGE FOR CONDUCTING FUEL FROM SAID BOWL TO SAID INDUCTION PASSAGE, AN AUXILIARY FUEL PASSAGE FOR CONDUCTING FUEL FROM SAID BOWL INTO SAID MAIN PASSAGE, A VALVE IN SAID BOWL FOR CONTROLLING THE FLOW OF FUEL THROUGH SAID AUXILIARY PASSAGE, AND MEANS FOR REGULATING THE POSITION OF SAID VALVE, SAID REGULATING MEANS COMPRISING MEANS BIASING THE VALVE TO CLOSED POSITION, MEANS ACTING AGAINST THE SAID BIASING MEANS FOR BIASING THE VALVE TO A MAXIMUM OPEN POSITION, AND VACUUM RESPONSIVE MEANS FOR ADJUSTING THE BIAS OF SAID SECOND MENTIONED BIASING MEANS WHEREBY TO ADJUST THE OPENING OF THE VALVE IN PROPORTION TO THE DEGREE OF VACUUM; SAID VALVE COMPRISING AN ORIFICE, A TAPERED PIN, AND MEANS MOUNTING SAID PIN FOR RECIPROCATING MOVEMENT IN THE ORIFICE; SAID SECOND MENTIONED BIASING MEANS COMPRISING A CONTACT FOR ABUTTING ENGAGEMENT WITH SAID TAPERED PIN AND A SPRING FOR URGING SAID CONTACT TOWARD SAID ABUTTING ENGAGEMENT, AND MEANS FOR SELECTIVELY ADJUSTING SAID MAXIMUM OPEN POSITION, SAID ADJUSTING MEANS COMPRISING AN ABUTMENT IN ENGAGEMENT WITH THE SPRING OF SAID SECOND MENTIONED BIASING MEANS AND MEANS ON THE BOWL FOR ADJUSTING THE POSITION OF THE ABUTMENT RELATIVE TO THE CLOSED POSITION INDEPENDENTLY OF THE CONTACT. 